have you heard about it?

ZEUS server web admin XSS

"Zeus Web Server is the most scalable, secure and high-performance web server software available,, underpinning business-critical solutions for the world's leading web hosting, content provider and secure e-commerce companies." (from:

Emm,... :-) another XSS, now on the ZEUS web admin interface.
The tested software is Zeus 4.2r2 (webadmin-4.2r2) on Linux x86.

This is not the same issue as bugtraq bid 6144 (index.fcgi),
now is on "vs_diag.cgi". Exploit is simple: http://<target>:9090/apps/web/vs_diag.cgi?server=<YOUR_CODE>

I have read this post: (, regarding "index.fcgi" XSS.

Mr, Colin Watson, claims that XSS bug on their software is not a big risk because: "The Zeus Administration Server uses cookies to record several items oftransient state: the state of the folding list of groups of virtualservers, and the list of currently monitored variables and machines ifreal-time monitoring is in place. It does not use cookies to store any security-sensitive information (...)"

Who needs cookies? :-) ZEUS uses "Basic Auth" (base 64 encoded) for the session tracking...but ZEUS does not allow http TRACE method, so we can not run a Cross Site Tracing against it :-(
I know litle about client side scripting, but probably there's some way to send POST requests and... change the admin password?, stop the web server?... I'm quite sure there's some way to do this. With the script we show below an attacker can do an HTTP request to the web admin interface of the ZEUS and redirect the output...
Of course you have to trick the admin...

http://<target>:9090/apps/web/vs_diag.cgi?server=<script>function%20pedo(){var%20xmlHttp %20=%20new%20ActiveXObject("Microsoft.XMLHTTP");"GET","http://<target>:9090 /apps/web/global.fcgi",false);xmlHttp.send();xmlDoc=xmlHttp.responseText;document.write(xmlDoc);} pedo();alert("Have%20you%20enabled%20the%20protection%20of%20your%20ZEUS...?%20We%20 can%20rip%20this%20info!%20Much%20more%20evil%20actions%20are%20possible...")</script>

This is for IE, for other browsers you may modify this code.
Imagination is the best friend of the attacker. Open your minds, XSS does not only means execution of commands on the client side... succefully exploited, in some scenarios (like web admin interfaces), those bugs can lead on execution of actions on the server side...

Hugo Vázquez Caramés & Toni Cortés Martínez

Hugo Vazquez Carames 


Hugo Vazquez Carames

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